Refactor admin UI for consolidated navigation and improved moderation workflow

- Updated Sidebar component to consolidate navigation items under new categories: Moderation, Content, and Operations.
- Removed outdated pages and integrated their functionalities into tabs under Players, Activity, Content, and Settings.
- Introduced new Activity and Content pages to house Audit, Player Logs, Community Board, and Loading Tips with tabbed navigation.
- Created a unified Moderation page combining Players, Bans, and Reports with tabbed navigation.
- Refactored individual pages (e.g., Audit, Bans, CommunityBoard, etc.) to support embedded mode for better integration within modals.
- Added Tabs component for consistent tab navigation across multiple pages.
- Updated README to reflect changes in navigation and settings structure.
- Removed Grants page as it is not yet implemented.

DorkNet.Server/admin-ui/src/pages/Moderation.tsx

@@ -0,0 +1,31 @@
+import { Players } from './Players';
+import { Bans } from './Bans';
+import { Reports } from './Reports';
+import { PageHeader } from '../components/PageHeader';
+import { Tabs, useTabParam } from '../components/Tabs';
+
+// Unified moderation hub. The account directory (with its per-player
+// detail / ban / grant / gift / password modal), the active-ban list,
+// and the open-report queue were three separate sidebar entries — they
+// describe one workflow, so they're tabs of one page now. The old
+// /bans and /reports routes redirect here with ?tab= preselected.
+export function Moderation() {
+  const [tab, setTab] = useTabParam<'directory' | 'bans' | 'reports'>('directory', ['directory', 'bans', 'reports']);
+  return (
+    <div>
+      <PageHeader title="Players" blurb="Search and moderate accounts, review active bans, and triage open reports." />
+      <Tabs
+        tabs={[
+          { key: 'directory', label: 'Directory' },
+          { key: 'bans', label: 'Bans' },
+          { key: 'reports', label: 'Reports' },
+        ]}
+        active={tab}
+        onChange={setTab}
+      />
+      {tab === 'directory' && <Players embedded />}
+      {tab === 'bans' && <Bans embedded />}
+      {tab === 'reports' && <Reports embedded />}
+    </div>
+  );
+}